Perfluorooctanesulfonamide (PFOSA) and 6:2 fluorotelomer sulfonate (FTSA) are widely present intermediates of per- and polyfluorinated substances (PFAS). Although detected at high concentrations in landfill leachate and groundwater, the interactions of these two compounds with plants have not been investigated much. In this work, uptake of these two PFAS intermediates at 10 and 200 μg/L by Lemna minor (common duckweed) were studied in detail. It was found that the biomass production of L. minor was not impacted negatively by PFOSA and FTSA at concentrations equal to or lower than 200 μg/L. Between these two target compounds, FTSA had much higher concentrations in L. minor when the concentrations and exposure times were the same as those for PFOSA. In addition, this compound at 200 μg/L inhibited the activities of catalase in L. minor significantly compared to the controls. This study indicates that PFOSA with low water solubility has low toxicity to L. minor, while FTSA at high concentration may accumulate in the floating plants and cause adverse effects on plant’s antioxidative defense system. Longer-term studies of L. minor with these two and other PFAS are warranted given the important role of this floating plant in the ecosystem.

全氟辛烷磺酰胺（PFOSA）和6：2氟调聚物磺酸盐（FTSA）是全氟化和多氟化物质（PFAS）广泛存在的中间体。尽管在垃圾渗滤液和地下水中以高浓度检测到了这两种化合物与植物之间的相互作用，但尚未对其进行大量研究。在这项工作中，详细研究了Lemna minor（普通浮萍）以10和200μg/ L吸收这两种PFAS中间体的情况。发现当浓度等于或低于200μg/ L时，PFOSA和FTSA不会对小木匠的生物量产生负面影响。在这两种目标化合物之间，FTSA在次要L.中的浓度要高得多。当浓度和暴露时间与PFOSA相同。此外，与对照相比，该化合物的浓度为200μg/ L，可显着抑制次要乳酸杆菌中过氧化氢酶的活性。这项研究表明，水溶性低的PFOSA对次要乳酸杆菌的毒性低，而高浓度的FTSA则可能在漂浮植物中积累，并对植物的抗氧化防御系统产生不利影响。鉴于该浮游植物在生态系统中的重要作用，有必要对这两个和其他PFAS进行L. minor的长期研究。